Propylene is a petrochemical product and an important chemical raw material used in the synthesis of isopropene, acetone, polypropylene, acrylonitrile, propylene oxide, plastics, synthetic rubber and detergents, etc. If not properly protected during its production, storage and use, there is a possibility of exposure and poisoning. Propylene has low toxicity and mainly acts on the central nervous system and cardiovascular system. Cardiac arrhythmia, blood pressure drop, heart failure and respiratory depression may occur. Principles of treatment: 1. Acute poisoning: (1) Remove the patient from the scene to fresh air, administer oxygen, keep warm, lie still, and avoid excessive physical activity and emotional agitation. (2) Keep the airway open, give central stimulants when respiratory depression occurs, and establish an artificial airway for mechanically assisted breathing if necessary. (3) Protect the liver, maintain water-electrolyte balance, detect and manage other complications in a timely manner and other supportive treatments. (4) Use catecholamines cautiously in severe poisoning, and be alert to and deal with possible serious arrhythmias. 2. Frostbite: If the skin is not yet rewarmed by contact with liquid acrylic, use 42°C warm water for local flushing and rewarming, and frostbite wounds can be treated with reference to surgical principles.